Machine for forming shells of paper or the like



E. F. HULBE RT. MACHINE FOR FORMING SHELLS OF PAPER. OR THE LIKE. APPLICATION FILED DEC. 27, I917- RENEWE-D\=OIT. 25. 1926.

1,380,10 Patented May 31, 1921.

5 SHEETSSHEET I.

INVENTOFI E. F..HULBE"RT. I MACHINE FOR FORMING SHELLS OF PAPER OR'THE LIKE.

APPLICATION FILED DEC. 27, 1917- RENEWED OCT. 25, I920. 1,380,104

Patented May 31, 1921.

5 SHEETS-SHEET 2.

WITNESSES E8} 0mg INVENTOR Patented May 31,1921.

5 SHEETS-SHEET 3- I E. F. HULBERT. MACHINE FOR FORMING SHELLS OF PAPER 03 THE LIKE.

APPLICATION FILED DEC.- 27, 191 7- RENEWED OCT. 25, I920- 7 v 4 EM. $3. 0 j 7 M 4% m 0L 1 w 1 Z \W I) m. KW

E. F. HULBERT.

MACHINE FOR FORMING SHELLS OF PAPER 0R THE'LIKE.

-APPLICATION FILED DEC. 21. I917. RENEWED 0m. 25. 1920.

Patented May '31, 1921.

5 SHEETS-SHEET (um mm M! a WITNESSES V E. F. HULBERT. MACHINE FOR FORMING SHELLS OF PAPER OR THE LIKE.

APPLICATION EILED DEC. 27, I91?- RENE 1,380,104.

WED OCT. 25,1920.-

Patented May 31, 1921.

5 SHEETS-SHEET 5.

WITNESSES The'paper is fed to the mandrel by feed EDWIN r. Hummer, or MILWAUKEE, WISCONSIN, ASSIGNOR To narrower. PAPER can COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION or DELAWARE.

MAeHmnPon FORMING SHELLS or PAPER OR THE- LIKE.

Specification of Letters Patent.

Patented May 31, 1921.

Application filed December 27, 1917, SerialNo. 209,185. Renewed October 25, 1920. Serial No.419,484.

To allwhom it may concern 1 Be it known that I, EDWIN F. HULBERT, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a new and useful Improvement in Machines for Forming Shells of Paper or the like, of which the following is a full, clear, and exact description of same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a vertical section through the machine.

Fig. 2 is an elevation of thehead of the machine, partly in section, showing the spray heads.

Fig. 3 is a section on the line III-III of Fig. 2.

Fig. 4 is a vertical section through the wax pump and driving. connections.

Fig. 5 is front elevation of the wax valve housing.

' Fi 6 is a vertical section along the line VI- I of Fig. 5.

Fig. 7 is a vertical section through the pressure operated thermostat, and Fig. 8 is a plan view of the thermostat with the cover plate removed. p

The present invention relates to machines for forming shells of paper or the hire, and more particularly to the mechanism in such machines for supplying a heated impregnatin or waterproofing material, such as para wax, to the paper. I

One-object of the invention is to provide means for controlling the heating of the wax. Another object is to provide a machine in which the shell forming mechanism is heated by the wax supplied from the reservoir. Another object is to provide means for lubricating certain moving parts by the heated wax. Other features of the invention relate to certain arrangements and combinations of arts hereinafter more particularly pointe out, the advantages of which will be apparent to those skilled in the art, from the following description.

The machine has a standard 2 in which is located a reservoir 3 for the wax, preferably parafiin. Carried at the top of the standard is a head or housing 4' which incloses the mechanism for winding the paper strips into shells. This mechanism includes a mandrel 5 upon which the shell is wound.

rolls 6, An endless chain belt 7 surrounds the mandrel and cooperates .therewith to press the layers of paper into the completed shell. Afterthe shell is wound on the mandrel it s stripped therefrom by an ejector 8 During-the shell windin operation, tension is applied to the end ess chain '7 to cause it-to. hug the mandrel and compress the shell against it. This tension is continued after the strip is wound on the mandrel to further consolidate the walls..- Then the chain is released and the ejector 8 is moved over'the mandrel, stripping the shell therefrom. After a shell is ejected, the feed rolls 6 supply another strip of paper to the mandrel and the cycle of operations s repeated. .The details of the, shell winding and paper feeding mechanisms do not form a part of the present inventidn but are covered in my copending a 'plications Serial No. 209,184, and Serial o. 209,186 filed of even date herewith. i

As the paper is fed to the mandrel it is impregnated with hot parafiin supplied by u per and lower spray heads 10 and 11.

he spray heads 10 and 11 are supplied with hot paraffin by means'of a ump 12 located in the reservoir 3 throug piping connections 13.

The hot paraffin is carried up from the pump through apipe 30 inclosed in the hollow drive shaft 1 The pipe 30 communicates through a va ve 31 with the supply pipe 13 of the spray heads 10 and 11. The valve 31 is provided with a tappet rod 32. The tappet rod is operated by a cam (not shown) in timed relation to the winding and ejecting mechanism to open the valve during the time the shell is being'wound and consolida-ted on the mandrel 5, and to close the valve 31 when the ejector is operating to strip the shell from the mandrel. The spring pressed bye-pass valve '35 is provided for by-passing the parafiin when the valve 31 is closed.- The by-pass valve 35 opens into a pocket 36 in which islocated the gear 25. The hot parafiin passing into. the pocket 36 serves to lubricate the gears 25 and 26. The paraffin in the pocket 36 leaks down through the clearance space around the drive shaft 17 thus lubricating it. The excess wax spills over the top of the pocket and drips back into the reservoir. An excess of wax is supplied to the paper from the spray; heads 10 and 11. This excess wax serves two purposes. It bathes the chain and its carrying rolls, the ejector, and the various bearings in the winding head. As all these parts are maintained hot, the li'uid paraffin makes a good lubricant for t e bearing surfaces. The other function of the hot arafiin'is to maintain the winding head 0t. The paraiiin is discharged through the winding mechanism by the spray heads 10 and 11 and it is found'to be sufficient so that no separate heating means need be em-.

ployed. The excess parafiin drips through drain ll) in the bottom of the housing l and returns to the reservoir where it is reheated.

The housing 4 and the inclosed winding mechanism are located immediately above the hot parallin reservoir 3' and are in communication with it through the drain opening 40. The heat rising from the reserx' oir also serves to maintain the winding mechanism at the proper degree of heat. It is found in operating the machine that after the parallin in the reservoir 3 is brought up to the proper temperature and the. pump 12.

operateolifor a short time to pump the hot wax to-the winding mechanism, the winding mechanism is brought to the proper degree of heat. The winding mechanism is sim-- plified in that no separate heating means needbe supplied to it.

The mechanism for maintaining the wax in the reservoir 3 at the proper temperature is as followsa-The reservoir 3 is a thin walled container and is surrounded by a jacket containing a mixture of water and alcohol. Below the jacket 50 is an electrical heatin element 51 supplied with current 7 throng the lead wires 52. The heating curtill rent is regulated by a pressure operated thermostat which controls a relay 6]. in the heating circuit 52. The thermostat 60 is connected to the upper part of the j achet '50 by pipe 65. The thermostat comprises a diaphragm chamber 70 in which. is located a thin metal diaphragm 71. The diaphragm 71 is formed of afdlshed piece of resilient sheet metal like the bottom of an oil-can and is arranged to snap upwardly when the pressure in the chamber 70 below it increases sutliciently. Resting against the to of the diaphragm 71 is a tappet rod 72, w 'ch extends into the contact box 75. Carried on the upper endofthe rod. '72 is a metal cup rename 77. A spring 78bears against the top of the cup 76 and tends to hold it in. contact with two stationary contacts 80 and 81. The cup 76 bridges the contacts 80 and 81' and closes the circuit which operates the relay 61. The spring diaphragm 71 may be adjusted to snap upwardly at the proper pressure, by means of a ring 85. 'Rings 85 having different size openings in them may be employed, the smaller the opening in the ring 85; the greater the pressure necessary to operate the diaphragm 71.

The finer adjustment of the thermostat is made by varying the proportion of alcohol and Water in the jacket 50. Thisproportion is chosen so that it the heat exceeds the desired temperature, a sutlicient pressure will be exerted under the diaphragm 71 to raise it. The upward movement of the diaphragm 71 lifts the contact cup 76 away from the stationary contacts, 80 and 81, breaking the circuit, denergizing the relay 61 and shutting oil the current to the heater 50. If the temperature drops, the pressure is reduced and the diaphragm 71 allowed to snap back into its lower position. I This causes contact cup 76 to bridge the station ary contacts 80 and 81, energizing the relay and switching thecurrent into the heater 50. By means of this pressure controlled then mostat, the temperature of the parailin in the reservoir 3 can be accurately maintained at the desired point. I

The tappet rod 3'2 is of such a length that when the diaphragm 71 snaps to its lower position, the tappetrod is out of contact with the cup 7 6 and its insulatin washer W. The lost motion thus provide insures quick break of the circuit, and insures positive seating of the contact cup 76 when the diaphragm is in its lower position.

While the preferred embodiment of the invention has been illustrated and described it is to he understood that the invention is not limited to its illustrated embodiment but I may be embodied in other structures within the scope of the following claims. I claim:

1. A machine for making shells'of paper or the like, comprising a mandrel and asscc iated mechanism for winding a sheet of material into a shell, means for supplying heated wax to the mandrel while the sheet is being wound, means for ejecting the Sill wound shell from the mandrel, and means or. the like, comprising a mandrel and assos ciated i mechanism for winding strip material into ashell, and means for sup plying heated wants the winding mechanism comprising. acontinuously driven O l pump, a supply pipe, a valve in the supply menace pipe, and means for opening and closing the valve to supply Wax to the winding mechanism during a part only of its cycle of operations; substantially as described.

3. A machine for forming shells of paper or the like, comprising a mandrel and associated mechanism for winding a strip of material into a shell, a pump for supplying Wax to the Winding'mechanism, connectionsfor driving the pump, and means for diverting a portion of the wax supplied by the pump for lubricating the said pump driving connections, substantially as described.

4. A machine for forming shells of paper or the like, comprising a mandrel and associated mechanism for Winding a strip of material into a shell, a reservoir for heated wax, a pump for supplying heated wax from the reservoir to the wlnding mechanism, and means for maintaining the reservoir at the proper temperature, including a jacket surroundin the reservoir and com taming an evapcra 1e liquid, and a thermostat operated by the pressure in the jacket; substantially asdescribed.

In testimony whereof, I have hereunto set my hand.

EDWIN F, BERT, 

